Pump.



J. ,MILBURN.

PUMP.

APPLICATION FILED JUNE 7, 1910.

1,005,270; v Patented Oct. 10,1911.

UNITED STATES .rosnrn MILIBURN, or navELocK NORTH, NEW ZEALAND.

PUMP.

Application filed lune 7,

Specification of Letters-Intent. Patented Oct. 16, 1911.

1910. Serial No. 565,624.

To all whom it may concern:

Be it known that I, JOSEPH MILBURN, a citizen of the Dominion of New Zealand, and residing at Havelock North, in the Provincial District of Hawkes Bay, in the Dominion of New Zealand, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

The invention relates to the class of pumps used especially for pumping chemicals and the like, or water containing grit and other impurities, the special object to be attained being to prevent the liquid being pumped from coming in contact with the pump cylinder and piston.

According to my present invention, a pump cylinder having a piston reciprocable within it, is in communication with a chamber in which is a partition or diaphragm of flexible material dividing the chamber into two compartments. Liquid is employed in the cylinder below the piston, and when the piston is reciprocated, the flexing of the diaphragm causes the fluid it is desired to pump to be alternately drawn into and expelled from the chamber upon the side of the diaphragm opposite the piston.

My invention is illustrated in the accompanying drawing wherein Figure 1, is a front sectional elevation,

Fig. 2, a plan, and Figs. 3 and 4 part sectional elevations. I

The piston 1 is reciprocated within the pump cylinder 2 by the rod 3. connected to the lever 4 working'within the casing 5 and operated by a hand lever 6.

The pump cylinder is fixed upon the cove;

7 of a chamber 8 with which it communicates through ports or passages 9 in the cover.

A circular diaphragm 10 of flexible material, preferably canvas coaterLwith rubber, is clamped around its circumferential edge between the cover and the top of the chamber and forms a flexible partition entirely dividing the upper from the lower part of the chamber. The chamber below the diaphragm communicates with an inlet valve 11 and discharge valve 12.

Fig. 3 illustrates another method of clamping the circumferential edge of the diaphragm between the top of the chamber and the cover. The chamber 13 has a recess 14.- which receives the circumferential edge 15 of the diaphragm, which'is turned over a continuous wire ring 16. 1 j I In Fig. 4 the top of the chamber 17 has a flat inclined face 18, and the edge of the diaphragm 19 is clamped between t and the cover 20. I

It is obvious that thereare many ways in which the edge of the diaphra in may be clamped between the top of the c amber and the cover.

21 which is fitted to a port 22 on the side of the pump cylinder is opened. The piston is then removed and the cylinder char ed with water up to the level of the port 52. The piston is then replaced and depressed to the limit of its stroke, which is the lower edge of port 22, water and air being expelled through the cock 21, which is then closed. Upon the piston being raised, the diaphragm is drawn up in the recess of the cover and the partial vacuum created beneath it causes the liquid it is desired to pump to enter through the inlet valve 11, and when the piston is returned, to be discharged through the discharge" valve 12. The cover and chamber are preferably so shaped that the circumferential edge of part of the. diaphragm is higher on the side nearest the .discharge valve than upon the opposite side, so that there is no liability for air to accumulate and thus form an airlock in the art of the chamber 0 posite the valve. Thls is clearly shown in l ig. 1 referring to whichit will be seen that the inlet port,.controlled by the valve 12, communicates with the lower chamber of the casing directly below the highest portion of the flexible diaphra The upper surface of such port is in ine with the diaphragm where the latter springs I; away from the beveled surface of the casing.

What I do claim and desire to secure by Letters Bit tent of the United States is 1. In A pump of the character described, the combination of a casin having a removable top or cover, a flexible diaphragm dividing the interior of the easing into two chambers and having its edge secured between the body of the casing and the said cover, a portion of said ed e bein higher than other portions thereo an in ct communicating with the chamber beneath the diaphragm, an outlet communicati with the chamber below the diaphragm a acent the elevated portion of the edge of the lat- In operation, in starting the pump, a cock' t I -v I 1, 7

ter, a cylinder communicating with the eating with the chamber beneath the diachamber 1n the casing above the diaphragm, phragm, a cylinder communicating with the and a piston in said cylinder. chamber above the diaphragm, and a piston 2.'In a pump of the character described, within the cylinder. 5 the combination of a casing provided with In testimony whereof I have aifixed my 15 inlet and outlet ports, the latter bein in a signature in presenceof two witnesses.

Ela ne abovethat 'of the inlet port, a exible JOSEPH MILBURN. iaphragm extending across the interior of Witnesses: the casing and inclined upwardly adjacent ANNm DOROTHY MCKENZIE,

10 the outlet port, both of said ports communi- ALEX Ross. 

